1021021111111 has 4 divisors (see below), whose sum is σ = 1027285044472. Its totient is φ = 1014757177752.

The previous prime is 1021021111093. The next prime is 1021021111153. The reversal of 1021021111111 is 1111111201201.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1021021111111 - 2⁵ = 1021021111079 is a prime.

It is a Duffinian number.

1021021111111 is a modest number, since divided by 1111111 gives 102102 as remainder.

It is a junction number, because it is equal to n+sod(n) for n = 1021021111091 and 1021021111100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1021021111181) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3131966436 + ... + 3131966761.

It is an arithmetic number, because the mean of its divisors is an integer number (256821261118).

Almost surely, 2^{1021021111111} is an apocalyptic number.

1021021111111 is a deficient number, since it is larger than the sum of its proper divisors (6263933361).

1021021111111 is an equidigital number, since it uses as much as digits as its factorization.

1021021111111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6263933360.

The product of its (nonzero) digits is 4, while the sum is 13.

Adding to 1021021111111 its reverse (1111111201201), we get a palindrome (2132132312312).

The spelling of 1021021111111 in words is "one trillion, twenty-one billion, twenty-one million, one hundred eleven thousand, one hundred eleven".